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Question (1)

QN0039255

A square of side metres lies in the xy-plane in a region, where the magnetic field is given
by , where is constant. The magnitude of flux passing through the square is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

As we know that, the magnetic flux linked with uniform surface of area in uniform magnetic field is .A

The direction of is perpendicular to the plane of square and square line in -y plane in a region.

As given that,

So,

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Question (2)

QN0039256

. A loop, made of straight edges has six corners at ,
and .   magnetic field  is present in the region. The flux passing through the
loop ABCDEFA (in that order) is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (3)

QN0039257

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to
touch the cylindrical surface through a contact. Then,

(A)
a direct current flows in the ammeter
(B)
no current flows through the ammeter
(C)
an alternating sinusoidal current flows through the ammeter A with a time period
(D)
a time varying non-sinusoidal current flows through the ammeter A.

Correct Answer: B

Explanation:

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Question (4)

QN0039258

There are two coils and as shown in figure a current starts flowing in as shown, when is moved towards and stops when A stops moving. The current in is counter clockwise. B is kept stationary when A moves. We can infer that

(A)
there is a constant current in the clockwise direction in
(B)
there is a varying current in
(C)
there is no current in
(D)
there is a constant current in the counter clockwise direction in

Correct Answer: D

Explanation:

When the coil A stops moving the current in B b ecome ze ro, it possible only if the current in is constant. If the current in would be variable, there must be an induced emf (current) in B even if the A stops moving. So there is a constant current in same direction or counter clockwise direction in as in by lenz's law.

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Question (5)

QN0039259

Same as problem 4 except the coil is made to rotate about a vertical axis (figure). No current flows in if is at rest. The current in coil , when the current in at is counter-clockwise and the coil is as shown at this instant, , is

(A)
constant current clockwise
(B)
varying current clockwise
(C)
varying current counter clockwise
(D)
constant current counter clockwise

Correct Answer: A

Explanation:

By Lenz's law, at the current in is counterclockwise and the coil is considered above to it. The counterclockwise flow of the current in is equivalent to north pole of magnet and magnetic field lines are emanating upward to coil A.
When coil A start rotating at , the current in is constant along clockwise direction by Lenz's rule. As flux changes across coil by rotating it near the -pole formed by flowing current in , in anticlockwise.

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Question (6)

QN0039260

The self inductance of a solenoid of length and area of cross-section , with a fixed number of turns increases as

(A)
and A increase
(B)
decreases and increases
(C)
increases and decreases
(D)
both and A decrease

Correct Answer: B

Explanation:

he self-inductance of a long solenoid of crosssectional area and length , having turns per unit length, filled the inside of the solenoid with a material of relative permeability is given by

As and are constant here so, to increase for a coil, area A must be increased and must be decreased.

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Question (1)

A square of side metres lies in the xy-plane in a region, where the magnetic field is given
by , where is constant. The magnitude of flux passing through the square is

Explanation:

Link:

Question (2)

. A loop, made of straight edges has six corners at ,
and .   magnetic field  is present in the region. The flux passing through the
loop ABCDEFA (in that order) is

Explanation:

Link:

Question (3)

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to
touch the cylindrical surface through a contact. Then,

Explanation:

Link:

Question (4)

There are two coils and as shown in figure a current starts flowing in as shown, when is moved towards and stops when A stops moving. The current in is counter clockwise. B is kept stationary when A moves. We can infer that

Explanation:

Link:

Question (5)

Same as problem 4 except the coil is made to rotate about a vertical axis (figure). No current flows in if is at rest. The current in coil , when the current in at is counter-clockwise and the coil is as shown at this instant, , is

Explanation:

Link:

Question (6)

The self inductance of a solenoid of length and area of cross-section , with a fixed number of turns increases as

Explanation:

Link:

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Question (1)

A square of side metres lies in the xy-plane in a region, where the magnetic field is given by , where is constant. The magnitude of flux passing through the square is

Explanation:

Link:

Question (2)

. A loop, made of straight edges has six corners at , and . magnetic field is present in the region. The flux passing through the loop ABCDEFA (in that order) is

Explanation:

Link:

Question (3)

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then,

Explanation:

Link:

Question (4)

There are two coils and as shown in figure a current starts flowing in as shown, when is moved towards and stops when A stops moving. The current in is counter clockwise. B is kept stationary when A moves. We can infer that

Explanation:

Link:

Question (5)

Same as problem 4 except the coil is made to rotate about a vertical axis (figure). No current flows in if is at rest. The current in coil , when the current in at is counter-clockwise and the coil is as shown at this instant, , is

Explanation:

Link:

Question (6)

The self inductance of a solenoid of length and area of cross-section , with a fixed number of turns increases as

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY

A square of side metres lies in the xy-plane in a region, where the magnetic field is given
by , where is constant. The magnitude of flux passing through the square is

. A loop, made of straight edges has six corners at ,
and . magnetic field is present in the region. The flux passing through the
loop ABCDEFA (in that order) is

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to
touch the cylindrical surface through a contact. Then,